export default class Config {
    static bulletCD: number = 240;      // 子弹发射间隔
    static bulletYVel: number = -10;     //子弹初始y速度
    static initHardDegree: number = 2.4      //初始困难系数
    static addHardInterval: number = 10000;       //增加难度系数间隔（ms）
    static planeMoveFactor: number = 0.4     //飞机移动系数
} 